[Web Payments] Use shippingType to choose the Payment Sheet shipping strings.

BUG=700499

Review-Url: https://codereview.chromium.org/2742643004
Cr-Commit-Position: refs/heads/master@{#456207}
diff --git a/components/payments/content/payment_request.h b/components/payments/content/payment_request.h
index 8ae228f..4a6507d 100644
--- a/components/payments/content/payment_request.h
+++ b/components/payments/content/payment_request.h
@@ -145,6 +145,7 @@
   }
 
   payments::mojom::PaymentDetails* details() { return details_.get(); }
+  payments::mojom::PaymentOptions* options() { return options_.get(); }
   const std::vector<std::string>& supported_card_networks() {
     return supported_card_networks_;
   }